JPH0446091Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is used for bearings for reciprocating linear motion, more specifically for receiving vertically moving slides of press machines that require high speed, high precision, and high rigidity. Regarding bearings.

[Prior Art] Conventionally, slide metal has been used as this type of bearing. However, with the slide metal, there is a gap at the contact portion with the slide that moves up and down, and play occurs. In addition, with slide metal sliding bearings, dimensional variations inevitably occur due to heat generation and oil film changes at high speeds.

[Problems to be solved by the invention] The present invention was made in view of the problems of the prior art as described above, and its purpose is to be used as a guide for the vertically moving slide of a press machine, and to reduce the load. It is supported by roller bearings. That is, the present invention provides a bearing for reciprocating linear motion in which preload can be applied between the inner raceway, outer frame, and rollers.

[Means for Solving the Problems] In order to achieve the above object, the bearing for reciprocating linear motion according to the present invention has a reciprocating linear motion bearing between the opposing surfaces of the inner raceway having a rectangular cross section and the outer frame having a larger rectangular cross section. The rollers are arranged so as to roll in the direction of relative reciprocating linear motion between the inner raceway and the outer frame, and each roller has an intermediate large diameter portion and small diameter ends at both ends, and the outer diameter is the intermediate large diameter portion. an elastic hollow cylinder having an inner diameter larger than that of the small diameter end and having an outer diameter larger than the outer diameter of the small diameter end, such that each of the hollow cylinders and each of the small diameter ends can rotate relative to each other. It is characterized by being fitted with. The elastic hollow cylinders at both ends of each roller are installed in an elastically deformed state between the inner raceway and the outer frame, and since each roller is held at both ends by the elastic hollow cylinders, skewing occurs with each stroke. (a phenomenon in which the rollers are tilted with respect to the normal axis of rotation), and the rollers are always held without wobbling regardless of dimensional variations.

[Example] The present invention will be described below with reference to the accompanying drawings.

Referring to FIG. 1, there is shown a slide 4 of a press machine slidably supported by a bearing device 10 of the present invention. Each bearing device 10 has a similar outer frame 5 of square cross section surrounding a slide 4 of square cross section.
The rollers 1 are horizontally arranged on each inner wall surface of the outer frame 5 so as to roll in the direction of the reciprocating linear movement of the slide 4. Between the upper and lower bearing devices 10,
The slide 4 is also guided and supported by a further fixed frame 11.

Referring to FIG. 2, bearing roller 1 according to the present invention
has an intermediate large-diameter portion 1a and small-diameter end portions 1b at both ends thereof. An elastic hollow cylinder 2 is fitted into each small diameter end 1b so that each of the elastic hollow cylinders 2 and each small diameter end 1b can rotate relative to each other. This elastic hollow cylinder 2 has an outer diameter larger than the outer diameter D1 of the intermediate large diameter portion 1a by △d, and the gap between the inner peripheral surface and the corresponding small diameter end 1b is △d+△e. It has such dimensions. Each hollow cylinder 2 is held by a stop ring 3 mounted on the outer end of the corresponding small diameter end 1b of the roller 1.

Referring to FIGS. 2 and 3, the rollers 1 are installed horizontally in recesses 5a provided on the inner surface of each side of an outer frame 5 surrounding the slide 4 and also having a rectangular cross section.
Inward flange plates, that is, stoppers 6a, 6b are fixed to the top and bottom surfaces 5b, 5c of the outer frame 5 with screws 7, and form a space 8 between them and the slide 4 in which the rollers 1 are accommodated. In this space 8, the roller 1 is installed with the elastic hollow cylinder 2 being elastically deformed.

At this time, the relationship between the stroke amount S, the length D2 of the elastic hollow cylinder 2 deformed into an elliptical shape, and the length L between the upper and lower stoppers is S=(L-D2)×2. Preferably.

[Function] The elastic hollow cylinder 2 attached to each small-diameter end 1b of the roller 1 is elastically deformed so that its inner peripheral surface becomes the small-diameter end 1b.
Moreover, since the outer peripheral surface is in contact with the inner surface of the outer frame 5, the elastic hollow cylinder 2 rolls in the space 8 together with the rollers 1 between the stoppers 6a and 6b of the outer frame 5.
Note that if it is desired to further increase the rigidity, the number of bearings of the present invention may be increased.

[Effects] In the bearing of the present invention, the roller has an intermediate large-diameter portion and small-diameter ends at both ends thereof, and an elastic hollow cylinder is fitted into each of the small-diameter ends in the manner described above. Therefore, when this is used, for example, as a bearing for receiving the slide of a press machine, the elastic hollow cylinders at both ends of the rollers are kept in an elastically deformed state so that frictional force is generated between the slide and the outer frame. The sag and roller are held at both ends by elastic hollow cylinders. Further, the small-diameter end of the roller and the elastic hollow cylinder are not integrated, but rotate separately. Therefore, for example, even if the middle large diameter part of the roller that rolls between the slide and the outer frame is inclined so that one end is lower than the other, the elastic hollow cylinder will hold both ends of the roller. Since the rollers and the elastic hollow cylinder are relatively rotatable, the tilting movement can be absorbed to some extent. Further, even if there is a difference in the rotational speed of the elastic hollow cylinders at both ends due to dimensional errors, the rollers will not immediately tilt due to this difference. This effectively prevents skewing.

In addition, the elastic hollow cylinders are fitted only at both ends of the roller, and the middle large diameter part of the roller is the same as a normal roller, so this middle large diameter part firmly supports the mating member. . That is, for example, in the illustrated embodiment described above, when the slide attempts to displace in the lateral direction, that is, in the direction of the outer frame, the intermediate large diameter portion firmly supports the slide to prevent such displacement. To support.

As described above, the bearing of the present invention has the advantage of firmly supporting the mating member and effectively preventing roller skewing. Therefore, when this is used, for example, as a bearing for receiving the slide of a press machine, the slide can be reciprocated smoothly with high precision and no play.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example in which a reciprocating linear motion bearing according to an embodiment of the present invention is used to receive a slide of a press machine. 2 is a partially sectional side view of a roller used in the bearing of FIG. 1. FIG. FIG. 3 is a cross-sectional view of a sliding part of a press machine using the rollers shown in FIG. 2. FIG. 4 is a longitudinal sectional view taken along the - line in FIG. 3. In the drawings, 1... Roller, 1a... Intermediate large diameter portion, 1b... Small diameter end, 2... Elastic hollow cylinder, 3
...Stop spring, 4...Slide, 5...Outer frame, 6a, 6b...Stopper, 7...Screw, 8...
...Space, 10...Bearing, 11...Fixed frame.

Claims (1)

[Scope of utility model registration request] Rollers are arranged between opposing surfaces of an inner raceway with a square cross section and an outer frame with a larger square cross section so as to roll in the direction of relative reciprocating linear motion between these inner raceways and the outer frame, and each roller has an intermediate large-diameter portion and small-diameter end portions at both ends thereof, and an elastic hollow cylinder having an outer diameter larger than that of the intermediate large-diameter portion and an inner diameter larger than the outer diameter of the small-diameter end portion; In each section,
A bearing for reciprocating linear motion, characterized in that each of the hollow cylinders and each of the small diameter ends are fitted so that they can rotate relative to each other.